Australian tennis great (5)
I believe the answer is:
laver
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">australian tennis great</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for laver that I've seen before include "Edible seaweed" , "Tennis player" , "Wimbledon champ" , "Rod - - (tennis)" .)